engineering graphics-free hand sketch
DESCRIPTION
Engineering Graphics-Free Hand SketchTRANSCRIPT
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Engineering Graphics-Free Hand Sketch
By
Mr.B.Ramesh, M.E., (Ph.D.),
Research Scholar, CEG, Anna University, Chennai.Associate Professor,
Department of Mechanical Engineering,,St. Joseph’s College of Engineering,
Jeppiaar Trust, Chennai-119
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Syllabus: Unit I
Plane curves and Free hand sketching (18)
Curves used in engineering practices:
Conics – Construction of ellipse, parabola and hyperbola by eccentricity method – Construction of cycloid – construction of involutes of square, pentagon and circle - Drawing of tangents and normal to the above curves.
Free hand sketching:
Representation of Three Dimensional objects – Need for and importance of multiple views and their placement – Developing visualization skills through free hand sketching of multiple views from pictorial views of objects.
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FOR T.V.
FOR S.V. FOR F.V.
FIRST ANGLE PROJECTION
IN THIS METHOD, THE OBJECT IS ASSUMED TO BE SITUATED IN FIRST QUADRANT
MEANS ABOVE HP & INFRONT OF VP.
OBJECT IS INBETWEENOBSERVER & PLANE.
ACTUAL PATTERN OF PLANES & VIEWS
IN FIRST ANGLE METHOD
OF PROJECTIONS
X Y
VP
HP
PP
FV LSV
TV
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4
1st ANGLE PROJECTION
OBSERVER
X
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FOR T.V.
FOR S.V. FOR F.V.
PICTORIAL PRESENTATION IS GIVENDRAW THREE VIEWS OF THIS OBJECT
BY FIRST ANGLE PROJECTION METHOD
ORTHOGRAPHIC PROJECTIONS
x y
FV SV
ALL VIEWS IDENTICAL
40
40
10
TOP VIEW
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x y
FRONT VIEW
TOP VIEW
L.H.SIDE VIEWFOR F.V.
FOR S.V.
FOR T.V.
PICTORIAL PRESENTATION IS GIVENDRAW THREE VIEWS OF THIS OBJECT
BY FIRST ANGLE PROJECTION METHOD
ORTHOGRAPHIC PROJECTIONS
![Page 7: Engineering Graphics-Free Hand Sketch](https://reader033.vdocuments.net/reader033/viewer/2022061319/5524d8ac4a79599d488b4919/html5/thumbnails/7.jpg)
FOR F.V.FOR S.V.
FOR T.V.
X Y
FRONT VIEW
TOP VIEW
L.H.SIDE VIEW
ORTHOGRAPHIC PROJECTIONS
PICTORIAL PRESENTATION IS GIVENDRAW THREE VIEWS OF THIS OBJECT
BY FIRST ANGLE PROJECTION METHOD
![Page 8: Engineering Graphics-Free Hand Sketch](https://reader033.vdocuments.net/reader033/viewer/2022061319/5524d8ac4a79599d488b4919/html5/thumbnails/8.jpg)
FOR T.V.
FOR S.V.
FOR F.V
.
PICTORIAL PRESENTATION IS GIVENDRAW THREE VIEWS OF THIS OBJECT
BY FIRST ANGLE PROJECTION METHOD
ORTHOGRAPHIC PROJECTIONS
FRONT VIEW
TOP VIEW
L.H.SIDE VIEW
X Y
![Page 9: Engineering Graphics-Free Hand Sketch](https://reader033.vdocuments.net/reader033/viewer/2022061319/5524d8ac4a79599d488b4919/html5/thumbnails/9.jpg)
FOR F.V.FOR S.V
.
FOR T.V.
ORTHOGRAPHIC PROJECTIONS
X Y
FRONT VIEW
TOP VIEW
L.H.SIDE VIEW
PICTORIAL PRESENTATION IS GIVENDRAW THREE VIEWS OF THIS OBJECT
BY FIRST ANGLE PROJECTION METHOD
![Page 10: Engineering Graphics-Free Hand Sketch](https://reader033.vdocuments.net/reader033/viewer/2022061319/5524d8ac4a79599d488b4919/html5/thumbnails/10.jpg)
FOR T.V.
FOR S.V.
FOR F.V.
PICTORIAL PRESENTATION IS GIVENDRAW THREE VIEWS OF THIS OBJECT
BY FIRST ANGLE PROJECTION METHOD
ORTHOGRAPHIC PROJECTIONS
FRONT VIEW
TOP VIEW
L.H.SIDE VIEW
X Y
![Page 11: Engineering Graphics-Free Hand Sketch](https://reader033.vdocuments.net/reader033/viewer/2022061319/5524d8ac4a79599d488b4919/html5/thumbnails/11.jpg)
FOR T.V.
FOR S.V. FOR F.V.
PICTORIAL PRESENTATION IS GIVENDRAW THREE VIEWS OF THIS OBJECT
BY FIRST ANGLE PROJECTION METHOD
ORTHOGRAPHIC PROJECTIONS
FRONT VIEW
TOP VIEW
L.H.SIDE VIEW
X Y
![Page 12: Engineering Graphics-Free Hand Sketch](https://reader033.vdocuments.net/reader033/viewer/2022061319/5524d8ac4a79599d488b4919/html5/thumbnails/12.jpg)
FOR T.V.
FOR S.V.
ORTHOGRAPHIC PROJECTIONS
FOR F.V.
FRONT VIEW
TOP VIEW
L.H.SIDE VIEW
X Y
PICTORIAL PRESENTATION IS GIVENDRAW THREE VIEWS OF THIS OBJECT
BY FIRST ANGLE PROJECTION METHOD
![Page 13: Engineering Graphics-Free Hand Sketch](https://reader033.vdocuments.net/reader033/viewer/2022061319/5524d8ac4a79599d488b4919/html5/thumbnails/13.jpg)
FOR T.V.
FOR F.V.
FOR S.V.
ORTHOGRAPHIC PROJECTIONS
FRONT VIEW
TOP VIEW
L.H.SIDE VIEW
X Y
PICTORIAL PRESENTATION IS GIVENDRAW THREE VIEWS OF THIS OBJECT
BY FIRST ANGLE PROJECTION METHOD
![Page 14: Engineering Graphics-Free Hand Sketch](https://reader033.vdocuments.net/reader033/viewer/2022061319/5524d8ac4a79599d488b4919/html5/thumbnails/14.jpg)
FOR T.V.
FOR F.V.FOR S.V
.
PICTORIAL PRESENTATION IS GIVENDRAW THREE VIEWS OF THIS OBJECT
BY FIRST ANGLE PROJECTION METHOD
ORTHOGRAPHIC PROJECTIONS
FRONT VIEW
TOP VIEW
L.H.SIDE VIEW
X Y
![Page 15: Engineering Graphics-Free Hand Sketch](https://reader033.vdocuments.net/reader033/viewer/2022061319/5524d8ac4a79599d488b4919/html5/thumbnails/15.jpg)
FOR T.V.
FOR F.V.FOR S.V.
ORTHOGRAPHIC PROJECTIONS
FRONT VIEW
TOP VIEW
L.H.SIDE VIEW
X Y
PICTORIAL PRESENTATION IS GIVENDRAW THREE VIEWS OF THIS OBJECT
BY FIRST ANGLE PROJECTION METHOD
![Page 16: Engineering Graphics-Free Hand Sketch](https://reader033.vdocuments.net/reader033/viewer/2022061319/5524d8ac4a79599d488b4919/html5/thumbnails/16.jpg)
General procedure for sketching orthographic views
from pictorial view (isometric view):
Step 1 : Sketch with free hand, the outline of all the required views with thin line (2H pencil).
Step 2 : Sketch with free hand, all the visible lines and visible circles in all the required views with thin line (2H pencil).
Step 3 : Sketch with free hand, all the hidden lines and hidden circles in all the required views with thin line (2H pencil).
Step 4 : After checking for technical mistakes if any, darken (with free hand) all the visible lines, hidden lines, visible circles/arcs and hidden
circles/arcs forming the required views with HB pencil.
Step 5 : Lettering (both alphabets and numbers) should be done with free hand.
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An example :
Make free-hand sketches of front, top and right side views of the
pictorial view shown below.
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Step 1 :
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Step 2
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Step 3 :
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Step 4 :
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Step 5 :